8.L/P Evolution + Earth Hist Crossword
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
                                             
 
 
Down: 1) Earth's continents move around over millions of years2) fossils in which minerals replace all of an organism, or part such as a dinosaur bone minerals4) A structure that enables an organism to survive in it's environment. Ex: long neck7) Form when a mold is filled with sand or mud that hardens and shapes into the organism11) principle that all living things descended from one organism that evolved into many different branches14) Uses radioactive decay of elements (how much has decayed?) to tell absolutely how old rocks are15) Chemical inside all life that codes it-- the "instruction manual" that creates your traits18) -Most ancient era with fossils -Many invertebrates like trilobites, crabs -First life on land like amphibians19) fossils of organisms that existed only during specific spans of time over large geographic areas. Help us tell how old rocks are! Across: 3) Variety of different versions of same genes/traits5) forms when entire organism or parts of organs are prevented from decaying by being trapped rock, amber, or tar6) Scientists drill deep into ice sheets producing ice cores hundreds of meters long. This can tell us about past climate!8) A behavior that enables an organism to survive its environment.9) The gradual change in a species over time10) Rock formed from hardened sediment. In layers12) A hollow area in sediment in the shape of an organism 13) New rock formed from cooled magma16) A track, trail, or burrow left in the geologic record by a moving animal.17) Change to internal organisms to survive an environment20) Older rock layers are under younger ones21) More than 3 billion years ago, first era! eukaryotes developed about 2/3 of the way through the era. Soft-bodied invertabrates formed No fossils yet since all soft22) Scientist who discovered natural selection23) Current era Humans appear Flowering plants take over24) forms when organisms re pressed between layers of soft mud or clay that hardens squeezing almost all decaying organisms away leaving the carbon imprint. Black and shiny25) -"Middle" era of fossils -Dinosaurs, large reptiles -Flowering plants appear
 

 

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